Tanner and Casey revolves around the life and antics of a man and his dog, who both live with the Montana family and their other pets. The man, named Tanner, got Casey in 2007, but gave her to the Montana's when he found owning her too hard, and then moved to New York to pursue his Science career. When it failed, he too joined the Montana's in NB, Canada, and now his life is crazier than ever. This is where our story begins...